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Openai/69174844-9774-8012-8b69-32262ca5e35a
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===== - 费曼传播子积分中广泛用复平面变形： ∫d4p(2π)4ip2−m2+iϵ\int \frac{d^4p}{(2\pi)^4}\frac{i}{p^2 - m^2 + i\epsilon}∫(2π)4d4pp2−m2+iϵi 解析延拓 + 留数计算是 QFT 的标准操作。 ===== * Wick rotation（t→−iτt\to -i\taut→−iτ）把 Minkowski 积分转成 Euclidean 积分。 :
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